Other-Bit Manipulation-Other#

_bextr_u32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned int
Param Types:: unsigned int a, unsigned int start, unsigned int len
Param ETypes:: UI32 a, UI32 start, UI32 len

unsigned int _bextr_u32(unsigned int a, unsigned int start, unsigned int len);

Intel Description

Extract contiguous bits from unsigned 32-bit integer “a”, and store the result in “dst”. Extract the number of bits specified by “len”, starting at the bit specified by “start”.

Intel Implementation Psudeo-Code

tmp[511:0] := a
dst[31:0] := ZeroExtend32(tmp[(start[7:0] + len[7:0] - 1):start[7:0]])

_bextr2_u32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned int
Param Types:: unsigned int a, unsigned int control
Param ETypes:: UI32 a, UI32 control

unsigned int _bextr2_u32(unsigned int a, unsigned int control);

Intel Description

Extract contiguous bits from unsigned 32-bit integer “a”, and store the result in “dst”. Extract the number of bits specified by bits 15:8 of “control”, starting at the bit specified by bits 0:7 of “control”.

Intel Implementation Psudeo-Code

start := control[7:0]
len := control[15:8]
tmp[511:0] := a
dst[31:0] := ZeroExtend32(tmp[(start[7:0] + len[7:0] - 1):start[7:0]])

_bextr_u64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned __int64
Param Types:: unsigned __int64 a, unsigned int start, unsigned int len
Param ETypes:: UI64 a, UI32 start, UI32 len

unsigned __int64 _bextr_u64(unsigned __int64 a, unsigned int start, unsigned int len);

Intel Description

Extract contiguous bits from unsigned 64-bit integer “a”, and store the result in “dst”. Extract the number of bits specified by “len”, starting at the bit specified by “start”.

Intel Implementation Psudeo-Code

tmp[511:0] := a
dst[63:0] := ZeroExtend64(tmp[(start[7:0] + len[7:0] - 1):start[7:0]])

_bextr2_u64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned __int64
Param Types:: unsigned __int64 a, unsigned __int64 control
Param ETypes:: UI64 a, UI64 control

unsigned __int64 _bextr2_u64(unsigned __int64 a, unsigned __int64 control);

Intel Description

Extract contiguous bits from unsigned 64-bit integer “a”, and store the result in “dst”. Extract the number of bits specified by bits 15:8 of “control”, starting at the bit specified by bits 0:7 of “control”..

Intel Implementation Psudeo-Code

start := control[7:0]
len := control[15:8]
tmp[511:0] := a
dst[63:0] := ZeroExtend64(tmp[(start[7:0] + len[7:0] - 1):start[7:0]])

_blsi_u32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned int
Param Types:: unsigned int a
Param ETypes:: UI32 a

unsigned int _blsi_u32(unsigned int a);

Intel Description

Extract the lowest set bit from unsigned 32-bit integer “a” and set the corresponding bit in “dst”. All other bits in “dst” are zeroed, and all bits are zeroed if no bits are set in “a”.

Intel Implementation Psudeo-Code

dst := (-a) AND a

_blsi_u64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned __int64
Param Types:: unsigned __int64 a
Param ETypes:: UI64 a

unsigned __int64 _blsi_u64(unsigned __int64 a);

Intel Description

Extract the lowest set bit from unsigned 64-bit integer “a” and set the corresponding bit in “dst”. All other bits in “dst” are zeroed, and all bits are zeroed if no bits are set in “a”.

Intel Implementation Psudeo-Code

dst := (-a) AND a

_blsmsk_u32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned int
Param Types:: unsigned int a
Param ETypes:: UI32 a

unsigned int _blsmsk_u32(unsigned int a);

Intel Description

Set all the lower bits of “dst” up to and including the lowest set bit in unsigned 32-bit integer “a”.

Intel Implementation Psudeo-Code

dst := (a - 1) XOR a

_blsmsk_u64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned __int64
Param Types:: unsigned __int64 a
Param ETypes:: UI64 a

unsigned __int64 _blsmsk_u64(unsigned __int64 a);

Intel Description

Set all the lower bits of “dst” up to and including the lowest set bit in unsigned 64-bit integer “a”.

Intel Implementation Psudeo-Code

dst := (a - 1) XOR a

_blsr_u32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned int
Param Types:: unsigned int a
Param ETypes:: UI32 a

unsigned int _blsr_u32(unsigned int a);

Intel Description

Copy all bits from unsigned 32-bit integer “a” to “dst”, and reset (set to 0) the bit in “dst” that corresponds to the lowest set bit in “a”.

Intel Implementation Psudeo-Code

dst := (a - 1) AND a

_blsr_u64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned __int64
Param Types:: unsigned __int64 a
Param ETypes:: UI64 a

unsigned __int64 _blsr_u64(unsigned __int64 a);

Intel Description

Copy all bits from unsigned 64-bit integer “a” to “dst”, and reset (set to 0) the bit in “dst” that corresponds to the lowest set bit in “a”.

Intel Implementation Psudeo-Code

dst := (a - 1) AND a

_andn_u32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned int
Param Types:: unsigned int a, unsigned int b
Param ETypes:: UI32 a, UI32 b

unsigned int _andn_u32(unsigned int a, unsigned int b);

Intel Description

Compute the bitwise NOT of 32-bit integer “a” and then AND with b, and store the results in dst.

Intel Implementation Psudeo-Code

dst[31:0] := ((NOT a[31:0]) AND b[31:0])

_andn_u64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned __int64
Param Types:: unsigned __int64 a, unsigned __int64 b
Param ETypes:: UI64 a, UI64 b

unsigned __int64 _andn_u64(unsigned __int64 a, unsigned __int64 b);

Intel Description

Compute the bitwise NOT of 64-bit integer “a” and then AND with b, and store the results in dst.

Intel Implementation Psudeo-Code

dst[63:0] := ((NOT a[63:0]) AND b[63:0])

_tzcnt_u16#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned short
Param Types:: unsigned short a
Param ETypes:: UI16 a

unsigned short _tzcnt_u16(unsigned short a);

Intel Description

Count the number of trailing zero bits in unsigned 16-bit integer “a”, and return that count in “dst”.

Intel Implementation Psudeo-Code

tmp := 0
dst := 0
DO WHILE ((tmp < 16) AND a[tmp] == 0)
        tmp := tmp + 1
        dst := dst + 1
OD

_tzcnt_u32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned int
Param Types:: unsigned int a
Param ETypes:: UI32 a

unsigned int _tzcnt_u32(unsigned int a);

Intel Description

Count the number of trailing zero bits in unsigned 32-bit integer “a”, and return that count in “dst”.

Intel Implementation Psudeo-Code

tmp := 0
dst := 0
DO WHILE ((tmp < 32) AND a[tmp] == 0)
        tmp := tmp + 1
        dst := dst + 1
OD

_tzcnt_u64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned __int64
Param Types:: unsigned __int64 a
Param ETypes:: UI64 a

unsigned __int64 _tzcnt_u64(unsigned __int64 a);

Intel Description

Count the number of trailing zero bits in unsigned 64-bit integer “a”, and return that count in “dst”.

Intel Implementation Psudeo-Code

tmp := 0
dst := 0
DO WHILE ((tmp < 64) AND a[tmp] == 0)
        tmp := tmp + 1
        dst := dst + 1
OD

_bzhi_u32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned int
Param Types:: unsigned int a, unsigned int index
Param ETypes:: UI32 a, UI32 index

unsigned int _bzhi_u32(unsigned int a, unsigned int index);

Intel Description

Copy all bits from unsigned 32-bit integer “a” to “dst”, and reset (set to 0) the high bits in “dst” starting at “index”.

Intel Implementation Psudeo-Code

n := index[7:0]
dst := a
IF (n < 32)
        dst[31:n] := 0
FI

_bzhi_u64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned __int64
Param Types:: unsigned __int64 a, unsigned int index
Param ETypes:: UI64 a, UI32 index

unsigned __int64 _bzhi_u64(unsigned __int64 a, unsigned int index);

Intel Description

Copy all bits from unsigned 64-bit integer “a” to “dst”, and reset (set to 0) the high bits in “dst” starting at “index”.

Intel Implementation Psudeo-Code

n := index[7:0]
dst := a
IF (n < 64)
        dst[63:n] := 0
FI

_pdep_u32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned int
Param Types:: unsigned int a, unsigned int mask
Param ETypes:: UI32 a, UI32 mask

unsigned int _pdep_u32(unsigned int a, unsigned int mask);

Intel Description

Deposit contiguous low bits from unsigned 32-bit integer “a” to “dst” at the corresponding bit locations specified by “mask”; all other bits in “dst” are set to zero.

Intel Implementation Psudeo-Code

tmp := a
dst := 0
m := 0
k := 0
DO WHILE m < 32
        IF mask[m] == 1
                dst[m] := tmp[k]
                k := k + 1
        FI
        m := m + 1
OD

_pdep_u64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned __int64
Param Types:: unsigned __int64 a, unsigned __int64 mask
Param ETypes:: UI64 a, UI64 mask

unsigned __int64 _pdep_u64(unsigned __int64 a, unsigned __int64 mask);

Intel Description

Deposit contiguous low bits from unsigned 64-bit integer “a” to “dst” at the corresponding bit locations specified by “mask”; all other bits in “dst” are set to zero.

Intel Implementation Psudeo-Code

tmp := a
dst := 0
m := 0
k := 0
DO WHILE m < 64
        IF mask[m] == 1
                dst[m] := tmp[k]
                k := k + 1
        FI
        m := m + 1
OD

_pext_u32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned int
Param Types:: unsigned int a, unsigned int mask
Param ETypes:: UI32 a, UI32 mask

unsigned int _pext_u32(unsigned int a, unsigned int mask);

Intel Description

Extract bits from unsigned 32-bit integer “a” at the corresponding bit locations specified by “mask” to contiguous low bits in “dst”; the remaining upper bits in “dst” are set to zero.

Intel Implementation Psudeo-Code

tmp := a
dst := 0
m := 0
k := 0
DO WHILE m < 32
        IF mask[m] == 1
                dst[k] := tmp[m]
                k := k + 1
        FI
        m := m + 1
OD

_pext_u64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned __int64
Param Types:: unsigned __int64 a, unsigned __int64 mask
Param ETypes:: UI64 a, UI64 mask

unsigned __int64 _pext_u64(unsigned __int64 a, unsigned __int64 mask);

Intel Description

Extract bits from unsigned 64-bit integer “a” at the corresponding bit locations specified by “mask” to contiguous low bits in “dst”; the remaining upper bits in “dst” are set to zero.

Intel Implementation Psudeo-Code

tmp := a
dst := 0
m := 0
k := 0
DO WHILE m < 64
        IF mask[m] == 1
                dst[k] := tmp[m]
                k := k + 1
        FI
        m := m + 1
OD

_lzcnt_u32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned int
Param Types:: unsigned int a
Param ETypes:: UI32 a

unsigned int _lzcnt_u32(unsigned int a);

Intel Description

Count the number of leading zero bits in unsigned 32-bit integer “a”, and return that count in “dst”.

Intel Implementation Psudeo-Code

tmp := 31
dst := 0
DO WHILE (tmp >= 0 AND a[tmp] == 0)
        tmp := tmp - 1
        dst := dst + 1
OD

_lzcnt_u64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned __int64
Param Types:: unsigned __int64 a
Param ETypes:: UI64 a

unsigned __int64 _lzcnt_u64(unsigned __int64 a);

Intel Description

Count the number of leading zero bits in unsigned 64-bit integer “a”, and return that count in “dst”.

Intel Implementation Psudeo-Code

tmp := 63
dst := 0
DO WHILE (tmp >= 0 AND a[tmp] == 0)
        tmp := tmp - 1
        dst := dst + 1
OD

_bit_scan_forward#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: int
Param Types:: int a
Param ETypes:: UI32 a

int _bit_scan_forward(int a);

Intel Description

Set “dst” to the index of the lowest set bit in 32-bit integer “a”. If no bits are set in “a” then “dst” is undefined.

Intel Implementation Psudeo-Code

tmp := 0
IF a == 0
        // dst is undefined
ELSE
        DO WHILE ((tmp < 32) AND a[tmp] == 0)
                tmp := tmp + 1
        OD
FI
dst := tmp

_bit_scan_reverse#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: int
Param Types:: int a
Param ETypes:: UI32 a

int _bit_scan_reverse(int a);

Intel Description

Set “dst” to the index of the highest set bit in 32-bit integer “a”. If no bits are set in “a” then “dst” is undefined.

Intel Implementation Psudeo-Code

tmp := 31
IF a == 0
        // dst is undefined
ELSE
        DO WHILE ((tmp > 0) AND a[tmp] == 0)
                tmp := tmp - 1
        OD
FI
dst := tmp

_BitScanForward#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: unsigned __int32* index, unsigned __int32 a
Param ETypes:: UI32 index, UI32 a

unsigned char _BitScanForward(unsigned __int32* index, unsigned __int32 a);

Intel Description

Set “index” to the index of the lowest set bit in 32-bit integer “mask”. If no bits are set in “a”, then “index” is undefined and “dst” is set to 0, otherwise “dst” is set to 1.

Intel Implementation Psudeo-Code

tmp := 0
IF a == 0
        // MEM[index+31:index] is undefined
        dst := 0
ELSE
        DO WHILE ((tmp < 32) AND a[tmp] == 0)
                tmp := tmp + 1
        OD
        MEM[index+31:index] := tmp
        dst := (tmp == 31) ? 0 : 1
FI

_BitScanReverse#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: unsigned __int32* index, unsigned __int32 a
Param ETypes:: UI32 index, UI32 a

unsigned char _BitScanReverse(unsigned __int32* index, unsigned __int32 a);

Intel Description

Set “index” to the index of the highest set bit in 32-bit integer “mask”. If no bits are set in “a”, then “index” is undefined and “dst” is set to 0, otherwise “dst” is set to 1.

Intel Implementation Psudeo-Code

tmp := 31
IF a == 0
        // MEM[index+31:index] is undefined
        dst := 0
ELSE
        DO WHILE ((tmp > 0) AND a[tmp] == 0)
                tmp := tmp - 1
        OD
        MEM[index+31:index] := tmp
        dst := (tmp == 0) ? 0 : 1
FI

_BitScanForward64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: unsigned __int32* index, unsigned __int64 a
Param ETypes:: UI32 index, UI64 a

unsigned char _BitScanForward64(unsigned __int32* index, unsigned __int64 a);

Intel Description

Intel Implementation Psudeo-Code

tmp := 0
IF a == 0
        // MEM[index+31:index] is undefined
        dst := 0
ELSE
        DO WHILE ((tmp < 64) AND a[tmp] == 0)
                tmp := tmp + 1
        OD
        MEM[index+31:index] := tmp
        dst := (tmp == 63) ? 0 : 1
FI

_BitScanReverse64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: unsigned __int32* index, unsigned __int64 a
Param ETypes:: UI32 index, UI64 a

unsigned char _BitScanReverse64(unsigned __int32* index, unsigned __int64 a);

Intel Description

Intel Implementation Psudeo-Code

tmp := 63
IF a == 0
        // MEM[index+31:index] is undefined
        dst := 0
ELSE
        DO WHILE ((tmp > 0) AND a[tmp] == 0)
                tmp := tmp - 1
        OD
        MEM[index+31:index] := tmp
        dst := (tmp == 0) ? 0 : 1
FI

_bittest#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: __int32* a, __int32 b
Param ETypes:: UI32 a, IMM b

unsigned char _bittest(__int32* a, __int32 b);

Intel Description

Return the bit at index “b” of 32-bit integer “a”.

Intel Implementation Psudeo-Code

addr := a + ZeroExtend64(b)
dst[0] := MEM[addr]

_bittestandcomplement#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: __int32* a, __int32 b
Param ETypes:: UI32 a, IMM b

unsigned char _bittestandcomplement(__int32* a, __int32 b);

Intel Description

Return the bit at index “b” of 32-bit integer “a”, and set that bit to its complement.

Intel Implementation Psudeo-Code

addr := a + ZeroExtend64(b)
dst[0] := MEM[addr]
MEM[addr] := ~dst[0]

_bittestandreset#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: __int32* a, __int32 b
Param ETypes:: UI32 a, IMM b

unsigned char _bittestandreset(__int32* a, __int32 b);

Intel Description

Return the bit at index “b” of 32-bit integer “a”, and set that bit to zero.

Intel Implementation Psudeo-Code

addr := a + ZeroExtend64(b)
dst[0] := MEM[addr]
MEM[addr] := 0

_bittestandset#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: __int32* a, __int32 b
Param ETypes:: UI32 a, IMM b

unsigned char _bittestandset(__int32* a, __int32 b);

Intel Description

Return the bit at index “b” of 32-bit integer “a”, and set that bit to one.

Intel Implementation Psudeo-Code

addr := a + ZeroExtend64(b)
dst[0] := MEM[addr]
MEM[addr] := 1

_bittest64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: __int64* a, __int64 b
Param ETypes:: UI64 a, IMM b

unsigned char _bittest64(__int64* a, __int64 b);

Intel Description

Return the bit at index “b” of 64-bit integer “a”.

Intel Implementation Psudeo-Code

addr := a + b
dst[0] := MEM[addr]

_bittestandcomplement64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: __int64* a, __int64 b
Param ETypes:: UI64 a, IMM b

unsigned char _bittestandcomplement64(__int64* a, __int64 b);

Intel Description

Return the bit at index “b” of 64-bit integer “a”, and set that bit to its complement.

Intel Implementation Psudeo-Code

addr := a + b
dst[0] := MEM[addr]
MEM[addr] := ~dst[0]

_bittestandreset64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: __int64* a, __int64 b
Param ETypes:: UI64 a, IMM b

unsigned char _bittestandreset64(__int64* a, __int64 b);

Intel Description

Return the bit at index “b” of 64-bit integer “a”, and set that bit to zero.

Intel Implementation Psudeo-Code

addr := a + b
dst[0] := MEM[addr]
MEM[addr] := 0

_bittestandset64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: unsigned char
Param Types:: __int64* a, __int64 b
Param ETypes:: UI64 a, IMM b

unsigned char _bittestandset64(__int64* a, __int64 b);

Intel Description

Return the bit at index “b” of 64-bit integer “a”, and set that bit to one.

Intel Implementation Psudeo-Code

addr := a + b
dst[0] := MEM[addr]
MEM[addr] := 1

_bswap#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: int
Param Types:: int a
Param ETypes:: UI32 a

int _bswap(int a);

Intel Description

Reverse the byte order of 32-bit integer “a”, and store the result in “dst”. This intrinsic is provided for conversion between little and big endian values.

Intel Implementation Psudeo-Code

dst[7:0] := a[31:24]
dst[15:8] := a[23:16]
dst[23:16] := a[15:8]
dst[31:24] := a[7:0]

_bswap64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: __int64
Param Types:: __int64 a
Param ETypes:: UI64 a

__int64 _bswap64(__int64 a);

Intel Description

Reverse the byte order of 64-bit integer “a”, and store the result in “dst”. This intrinsic is provided for conversion between little and big endian values.

Intel Implementation Psudeo-Code

dst[7:0] := a[63:56]
dst[15:8] := a[55:48]
dst[23:16] := a[47:40]
dst[31:24] := a[39:32]
dst[39:32] := a[31:24]
dst[47:40] := a[23:16]
dst[55:48] := a[15:8]
dst[63:56] := a[7:0]

_popcnt32#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: int
Param Types:: int a
Param ETypes:: UI32 a

int _popcnt32(int a);

Intel Description

Count the number of bits set to 1 in 32-bit integer “a”, and return that count in “dst”.

Intel Implementation Psudeo-Code

dst := 0
FOR i := 0 to 31
        IF a[i]
                dst := dst + 1
        FI
ENDFOR

_popcnt64#

Tech:: Other
Category:: Bit Manipulation
Header:: immintrin.h
Searchable:: Other-Bit Manipulation-Other
Return Type:: int
Param Types:: __int64 a
Param ETypes:: UI64 a

int _popcnt64(__int64 a);

Intel Description

Count the number of bits set to 1 in 64-bit integer “a”, and return that count in “dst”.

Intel Implementation Psudeo-Code

dst := 0
FOR i := 0 to 63
        IF a[i]
                dst := dst + 1
        FI
ENDFOR

Other-Bit Manipulation-Other

Contents

Other-Bit Manipulation-Other#

_bextr_u32#

_bextr2_u32#

_bextr_u64#

_bextr2_u64#

_blsi_u32#

_blsi_u64#

_blsmsk_u32#

_blsmsk_u64#

_blsr_u32#

_blsr_u64#

_andn_u32#

_andn_u64#

_tzcnt_u16#

_tzcnt_u32#

_tzcnt_u64#

_bzhi_u32#

_bzhi_u64#

_pdep_u32#

_pdep_u64#

_pext_u32#

_pext_u64#

_lzcnt_u32#

_lzcnt_u64#

_bit_scan_forward#

_bit_scan_reverse#

_BitScanForward#

_BitScanReverse#

_BitScanForward64#

_BitScanReverse64#

_bittest#

_bittestandcomplement#

_bittestandreset#

_bittestandset#

_bittest64#

_bittestandcomplement64#

_bittestandreset64#

_bittestandset64#

_bswap#

_bswap64#

_popcnt32#

_popcnt64#